package com.andy.web.validate.controller;


import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Random;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.andy.util.CommUtil;

@Controller
@RequestMapping(value = "/verify")
public class RemoteValidateController {
	
	private Logger LOGGER = LoggerFactory.getLogger(RemoteValidateController.class);
	
	/**
	 * 发送验证码
	 * @param request
	 * @param response
	 * @param session
	 * @param name
	 * @throws IOException
	 */
	@RequestMapping("/sendcode")
	public void verify(HttpServletRequest request, HttpServletResponse response, HttpSession session, String name){
		response.setContentType("image/jpeg");
		response.setHeader("Pragma", "No-cache");
		response.setHeader("Cache-Control", "no-cache");
		response.setDateHeader("Expires", 0);

		int width = 73, height = 27;
		BufferedImage image = new BufferedImage(width, height,
				BufferedImage.TYPE_INT_RGB);
		Graphics g = image.getGraphics();
		Random random = new Random();
		g.setColor(getRandColor(200, 250));
		g.fillRect(0, 0, width, height);
		g.setFont(new Font("Times New Roman", Font.PLAIN, 24));
		g.setColor(getRandColor(160, 200));
		for (int i = 0; i < 155; i++) {
			int x = random.nextInt(width);
			int y = random.nextInt(height);
			int xl = random.nextInt(12);
			int yl = random.nextInt(12);
			g.drawLine(x, y, x + xl, y + yl);
		}

		String sRand = "";
		for (int i = 0; i < 4; i++) {
			String rand = CommUtil.randomInt(1).toUpperCase();
			sRand += rand;
			g.setColor(new Color(20 + random.nextInt(110), 20 + random
					.nextInt(110), 20 + random.nextInt(110)));
			g.drawString(rand, 13 * i + 6, 24);
		}

		if (CommUtil.null2String(name).equals("")) {
			session.setAttribute("code", sRand);
		} else {
			session.setAttribute(name, sRand);
		}
		
		g.dispose();
		try {
			ServletOutputStream responseOutputStream = response.getOutputStream();
			ImageIO.write(image, "JPEG", responseOutputStream);
			responseOutputStream.flush();
			responseOutputStream.close();
		} catch (Exception e) {
			LOGGER.error(String.format("error occurs while sending code to client, error stack:[%s]", e.getMessage()));
		}
	}

	private Color getRandColor(int fc, int bc) {// 缁欏畾鑼冨洿鑾峰緱闅忔満棰滆壊
		Random random = new Random();
		if (fc > 255)
			fc = 255;
		if (bc > 255)
			bc = 255;
		int r = fc + random.nextInt(bc - fc);
		int g = fc + random.nextInt(bc - fc);
		int b = fc + random.nextInt(bc - fc);
		return new Color(r, g, b);
	}
	
	/**
	 * 妫�鏌ユ枃鏈獙璇佺爜鐨勬纭��
	 * @param request
	 * @param response
	 * @return
	 * @throws IOException
	 */
	@RequestMapping(value = "checkVerifyCode")
	@ResponseBody 
	public boolean checkVerifyCode(HttpServletRequest request, HttpServletResponse response) throws IOException {
		String verifyCode = request.getParameter("verifyCode");
		if(CommUtil.isNotNull(verifyCode)) {
			String sessionVerifyCode = (String) request.getSession().getAttribute("code");
			if(verifyCode.equals(sessionVerifyCode)) {
				return true;
			} 
		} 
		return false;
	}
	
}
